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ATLAS discoveries of optical transients

ATel #9385; J. Tonry, L. Denneau, B. Stalder, A. Heinze, A. Sherstyuk (IfA, University of Hawaii), A. Rest (STScI), K. W. Smith, S. J. Smartt (Queen's University Belfast)
on 18 Aug 2016; 15:21 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ken Smith (k.w.smith@qub.ac.uk)

Subjects: Optical, Supernovae, Transient

We report the following transients found by the ATLAS survey (see Tonry et al. ATel #8680). ATLAS is a twin 0.5m telescope system on Haleakala and Mauna Loa. The first unit is operational on Haleakala is robotically surveying the sky. Two filters are used, cyan and orange (denoted c and o, all mags in AB system), more information is on http://www.fallingstar.com. All transients have been registered with the IAU.

Host galaxy identifications and redshifts are from NED or the Pan-STARRS1 3Pi image stack, and absolute magnitude calculations include an estimate of Milky Way foreground extinction at the filter wavelength.

 
Name      | ATLAS Name | RA (J2000)  | Dec (J2000) | Disc. MJD | Disc. Date  | Disc Mag |    z     | Notes 
AT2016ewx | ATLAS16cik | 00:45:07.50 | +13:52:48.2 | 57591.58  | 20160722.58 |  18.00 o |          |   1. 
AT2016eww | ATLAS16cil | 20:20:58.96 | +00:46:25.2 | 57607.42  | 20160807.42 |  17.50 c |          |   2. 
AT2016ewy | ATLAS16cii | 20:38:18.87 | +14:48:36.2 | 57607.46  | 20160807.46 |  17.89 c |          |   3. 
AT2016ewz | ATLAS16cjc | 20:37:40.83 | +12:04:19.3 | 57607.46  | 20160807.46 |  18.23 c |          |   4. 
AT2016exa | ATLAS16cjd | 23:47:03.83 | -01:43:41.7 | 57607.53  | 20160807.53 |  17.78 c |          |   5. 
AT2016eyr | ATLAS16cjv | 02:56:05.80 | -14:11:18.6 | 57608.59  | 20160808.59 |  18.19 c | 0.028933 |   6. 

1. SDSS DR12 reports that the likely host (6.67 arcsec away) is SDSS J004507.42+135254.8 with photometric redshift z=0.062
2. Dwarf nova outburst announced by MASTER as OT J202058.97+004625.2 (ATel #9374). Hostless; nothing visible in the PS1 stack.
3. Hostless; nothing visible in the PS1 stack. Probable CV.
4. Probable host is uncatalogued galaxy (clearly visible in DSS and PS1 stack) about 15 arcsec from transient.
5. SDSS DR12 reports that the likely host (0.57 arcsec away) is SDSS J234703.87-014341.5 with photometric redshift z=0.055
6. NED reports that the likely host (11.4 arcsec away) is IC 0272 with spectroscopic redshift z=0.028933, hence mu=35.37, A_c=0.13, M_c=-17.18.